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author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2014-04-23 01:26:26 +0400 |
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committer | Jason Cooper <jason@lakedaemon.net> | 2014-04-26 23:45:06 +0400 |
commit | deac3d874ea1e1ef50604cec33ddfb01edb0c976 (patch) | |
tree | 7524fce14d00fb8d76cb56ac453f36517889d3fd /arch/arm/mach-kirkwood | |
parent | 0180ed45da5198e0e7362c56b3a107d3278666f6 (diff) | |
download | linux-deac3d874ea1e1ef50604cec33ddfb01edb0c976.tar.xz |
ARM: orion: switch to a per-platform handle_irq() function
Moving to the Device Tree implies having CONFIG_MULTI_IRQ_HANDLER
enabled, even for non-DT platforms (if we want both DT and non-DT
platforms to be supported in a single kernel).
However, the common CONFIG_MULTI_IRQ_HANDLER handler for non-DT
platforms in plat-orion/irq.c doesn't match the needs of
Orion5x. Also, it doesn't make much sense for orion_irq_init() to
register the multi-IRQ handler: orion_irq_init() is called once for
each IRQ cause/mask tuple, while the multi-IRQ handler only needs to
be registered once.
To solve this problem, we move the multi-IRQ handle in per-platform
code: mach-kirkwood/irq.c and mach-dove/irq.c. The Orion5x variant
will be introduced in a followup commit. Of course, this code will
ultimately be completely removed once all boards are converted to the
Device Tree.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: https://lkml.kernel.org/r/1398202002-28530-23-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'arch/arm/mach-kirkwood')
-rw-r--r-- | arch/arm/mach-kirkwood/irq.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/arm/mach-kirkwood/irq.c b/arch/arm/mach-kirkwood/irq.c index 2a97a2e4163c..2c47a8ad0e27 100644 --- a/arch/arm/mach-kirkwood/irq.c +++ b/arch/arm/mach-kirkwood/irq.c @@ -7,6 +7,7 @@ * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ +#include <asm/exception.h> #include <linux/gpio.h> #include <linux/kernel.h> #include <linux/irq.h> @@ -30,11 +31,47 @@ static int __initdata gpio1_irqs[4] = { 0, }; +#ifdef CONFIG_MULTI_IRQ_HANDLER +/* + * Compiling with both non-DT and DT support enabled, will + * break asm irq handler used by non-DT boards. Therefore, + * we provide a C-style irq handler even for non-DT boards, + * if MULTI_IRQ_HANDLER is set. + */ + +static void __iomem *kirkwood_irq_base = IRQ_VIRT_BASE; + +asmlinkage void +__exception_irq_entry kirkwood_legacy_handle_irq(struct pt_regs *regs) +{ + u32 stat; + + stat = readl_relaxed(kirkwood_irq_base + IRQ_CAUSE_LOW_OFF); + stat &= readl_relaxed(kirkwood_irq_base + IRQ_MASK_LOW_OFF); + if (stat) { + unsigned int hwirq = __fls(stat); + handle_IRQ(hwirq, regs); + return; + } + stat = readl_relaxed(kirkwood_irq_base + IRQ_CAUSE_HIGH_OFF); + stat &= readl_relaxed(kirkwood_irq_base + IRQ_MASK_HIGH_OFF); + if (stat) { + unsigned int hwirq = 32 + __fls(stat); + handle_IRQ(hwirq, regs); + return; + } +} +#endif + void __init kirkwood_init_irq(void) { orion_irq_init(0, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF); orion_irq_init(32, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF); +#ifdef CONFIG_MULTI_IRQ_HANDLER + set_handle_irq(kirkwood_legacy_handle_irq); +#endif + /* * Initialize gpiolib for GPIOs 0-49. */ |